In a large nonstick skillet, heat 3 tablespoons of the olive oil until shimmering. Add the diced eggplant, season with salt and pepper and cook over moderately high heat, stirring, for 2 minutes. Reduce the heat to low and cook, stirring occasionally, until the eggplant is tender, about 10 minutes. Transfer the eggplant to a large bowl. Wipe out the skillet.